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Teachers ask questions, and prompt them to think deeply about the subject matter. A key idea or assignment might require that the teacher present material to the class, but the forward progress of the class is driven by the questions that the teacher asks of the students, the answers that they give, and the further questions that those answers ...
Magnetism is the class of physical attributes that occur through a magnetic field, which allows objects to attract or repel each other. Because both electric currents and magnetic moments of elementary particles give rise to a magnetic field, magnetism is one of two aspects of electromagnetism .
Ørsted investigated and found the physical law describing the magnetic field, now known as Ørsted's law. Ørsted's discovery was the first connection found between electricity and magnetism, and the first of two laws that link the two; the other is Faraday's law of induction.
It instructed a task force to study the question in readiness for the next meeting. [ 9 ] In 1930, TC1 decided that the magnetic field strength ( H ) is of a different nature from the magnetic flux density ( B ), [ 9 ] and took up the question of naming the units for these fields and related quantities, among them the integral of magnetic flux ...
Einstein's 1905 paper that introduced the world to relativity opens with a description of the magnet/conductor problem: [3]. It is known that Maxwell's electrodynamics – as usually understood at the present time – when applied to moving bodies, leads to asymmetries which do not appear to be inherent in the phenomena.
Magnets exert forces and torques on each other through the interaction of their magnetic fields.The forces of attraction and repulsion are a result of these interactions. The magnetic field of each magnet is due to microscopic currents of electrically charged electrons orbiting nuclei and the intrinsic magnetism of fundamental particles (such as electrons) that make up the mater
In magnetism, the Curie–Weiss law describes the magnetic susceptibility χ of a ferromagnet in the paramagnetic region above the Curie temperature: = where C is a material-specific Curie constant, T is the absolute temperature, and T C is the Curie temperature, both measured in kelvin.
The second of Maxwell's equations is known as Gauss's law for magnetism and, similarly to the first Gauss's law, it describes flux, but instead of electric flux, it describes magnetic flux. According to Gauss's law for magnetism, the flow of magnetic field through a closed surface is always zero.